// 取浏览器的 CSS 前缀
var prefix = function() {
  var div = document.createElement('div');
  var cssText = '-webkit-transition:all .1s; -moz-transition:all .1s; -o-transition:all .1s; -ms-transition:all .1s; transition:all .1s;';
  div.style.cssText = cssText;
  var style = div.style;
  if (style.webkitTransition) {
    return '-webkit-';
  }
  if (style.MozTransition) {
    return '-moz-';
  }
  if (style.oTransition) {
    return '-o-';
  }
  if (style.msTransition) {
    return '-ms-';
  }
  return '';
}();

var styles = window.getComputedStyle(document.documentElement, '');
var arr = [].slice.call(styles);
console.log(arr);

// 取浏览器的 CSS 前缀
var prefix = function() {
  var styles = window.getComputedStyle(document.documentElement, '');
  var core = (
    Array.prototype.slice
    .call(styles)
    .join('')
    .match(/-(moz|webkit|ms)-/) || (styles.OLink === '' && ['', 'o'])
  )[1];
  return '-' + core + '-';
}();